这是添加用户的判断语句

index.php

if (isset($_POST['submit'])){
              if ($_POST['name'] == '') {
                  echo "<script>alert('非法输入！')</script>";
              }elseif ($_POST['pw'] == '') {
                  echo "<script>alert('非法输入！')</script>";
              }elseif ($_POST['repw'] == '') {
                  echo "<script>alert('非法输入！')</script>";
              }elseif ($_POST['pw'] == $_POST['repw']) {
                  $query = "insert into user (name,pw,role) values('{$_POST['name']}','{$_POST['pw']}','{$_POST['role']}')";
                  $result=mysqli_query($link, $query);
                  echo "<script>alert('添加新用户成功！')</script>";
              }else{
                  echo "<script>alert('用户名与密码不一致！')</script>";
              }